CONVERGENCE OF FILIFORM POLLEN MORPHOLOGIES IN SEAGRASSES - FUNCTIONAL MECHANISMS

被引:32
作者
ACKERMAN, JD
机构
[1] CORNELL UNIV,DIV BIOL SCI,PLANT BIOL SECT,ITHACA,NY 14853
[2] CORNELL UNIV,DIV BIOL SCI,ECOL & SYSTEMAT SECT,ITHACA,NY 14853
关键词
CONVERGENCE; HYDROPHILY; SEAGRASS; POLLINATION; SUBMARINE POLLINATION; BIOMECHANICS;
D O I
10.1007/BF01237753
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The peculiar filiform pollen morphology and ability to pollinate in an aquatic medium have evolved convergently in the marine angiosperms or 'seagrasses'. A comparison of these systems with freshwater ones, reveals that reproductive strategy alone does not provide sufficient information to understand this convergence. Several models have, however, been proposed to explain the function and evolution of seagrass pollen morphologies. The first is a mathematical model, random search theory, which requires pollen to travel both 'randomly' and perpendicularly to its path. It is elegant conceptually, but does not hold up to physical and empirical scrutiny. Conversely, a biophysical model, which requires pollen to obey the fluid dynamic principles of boundary-layer flow, may be complicated conceptually, but it is consistent with mathematics and nature. The correct modelling of pollination mechanisms in seagrasses provides an understanding of contemporary adaptations as well as the processes that selected them.
引用
收藏
页码:139 / 153
页数:15
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